BEIJING, Sept 17 (Reuters) - Base metals prices fell sharply in early Asian trade on Monday on reports that U.S. tariffs on $200 billion of Chinese goods could be imposed immediately. The tit-for-tat trade row between the world's top two economies has left investors fearing that demand for industrial metals will soften. FUNDAMENTALS: * COPPER: Three-month copper on the London Metal Exchange fell as much as 1.9 percent to $5,861.50 a tonne and stood at $5,890 a tonne as of 0136 GMT, after shedding 1 percent on Friday. The most-traded November copper contract on the Shanghai Futures Exchange slipped 1.4 percent to 47,940 yuan ($6,977.86)a tonne. * TARIFFS: U.S. President Donald Trump is likely to announce new tariffs on about $200 billion on Chinese imports as early as Monday, a senior administration official told Reuters on Saturday. * OTHER METALS: LME nickel fell furthest, tumbling as much as 3.2 percent overnight to $12,250 a tonne, its lowest since Sept. 12, before trimming losses to around 2 percent. Only Shanghai tin was in positive territory, inching up 0.1 percent. * TAXES: Chile's congress is studying a proposal for an additional royalty payment for copper and lithium miners operating in the country to bolster the development of the regions around their deposits, according to a draft seen by Reuters. * HYDRO/RIO: Norway's Hydro said on Friday it had dropped plans to buy several of Rio Tinto's, assets, including an aluminium plant in Iceland, after approval from European Commission regulators took longer than anticipated. * PERU: Brazilian mining company Nexa Resources, MIL.LM plans to invest some $1.17 billion in copper and zinc projects in Peru and Brazil over the next five years, the company's general manager Ricardo Porta said on Friday. * DRC: The prime minister of Democratic Republic of Congo will sign a decree in the coming days to designate cobalt and other minerals as "strategic" and therefore subject to higher royalties, Mines Minister Martin Kabwelulu said on Saturday.